Use mental math to find what answer completes the equation below. Explain why is your answer correct.
36,000 divided by _____ = 90
A:4
B:40
C:400
D:4000
To find the answer, we can think about what number divided by the given number (in this case 90) would give us the original number (in this case 36,000).
Let's start with option A: 36,000 divided by 4. If we divide 36,000 by 4, we get 9,000, not 90. So option A is not the correct answer.
Moving on to option B: 36,000 divided by 40. If we divide 36,000 by 40, we get 900, not 90. So option B is also not the correct answer.
Next, option C: 36,000 divided by 400. If we divide 36,000 by 400, we get 90. Therefore, option C is the correct answer.
Finally, option D: 36,000 divided by 4000. If we divide 36,000 by 4000, we get 9, not 90. So option D is not the correct answer.
Based on this reasoning, the correct answer to the equation is C: 400.